Chinese vice foreign minister Fu Ying said Beijing was ready for “any escalation” of a tense maritime standoff with the Philippines over a disputed shoal. However, the Philippines said Tuesday it was working to ease a tense territorial stand-off with China, following a warning from the Chinese government. “We are endeavoring to undertake a new diplomatic initiative which we hope will help the situation,” foreign department spokesman Raul Hernandez said via text message when asked for a response to the Chinese statement. Hernandez said he would not provide further details of the Philippine efforts. The month-long flare-up is one of the most high-profile incidents for years between the two countries over their competing territorial claims to parts of the South China Sea, which is believed to sit atop vast oil and gas deposits. “The Chinese side has... made all preparations to respond to any escalation of the situation by the Philippine side,” Fu told a Philippine diplomat Monday, according to a statement posted on China's foreign ministry website Tuesday. The two countries have been locked in the row since April 8, when Beijing's vessels blocked a Philippine warship from arresting crews of Chinese fishing boats near the disputed Scarborough Shoal – or Huangyan island in Chinese. Both Beijing and Manila have sent ships to the area, racking up tensions in the region. Currently, four Chinese surveillance ships and 10 fishing boats have anchored off the disputed shoal, facing off against two Philippine coastguard ships and a fisheries bureau vessel. On Monday, Fu summoned Alex Chua, charge d'affaires at the Philippine embassy in China, so that she could make a “serious representation” over the situation, according to the statement. “It is obvious that the Philippine side has not realized that it is making serious mistakes and instead is stepping up efforts to escalate tensions,” she told him. “The Philippine side... repeatedly made erroneous remarks which misled the public in the Philippines and the international community, played up the public feelings, thus severely damaging the atmosphere of the bilateral relations between China and the Philippines. “Therefore, it is hard for us to be optimistic about the situation.” The Philippines argues the shoal is well within the country's 200-nautical-mile exclusive economic zone, as recognized by international law. But Beijing claims almost the whole of the South China Sea as its historical territory, even waters close to other countries' coasts and hundreds of kilometers from its own landmass.